If you like Bluebird, you may also want a Chrome / Firefox theme to match. Below you'll find a theme that matches Chrome perfectly and a Firefox 4 theme which isn't a perfect match for Bluebird but looks great nevertheless. The Firefox 4 theme actually integrates quite well with other themes too.

Chrome / Chromium

For Chrome there's a theme that matches Blubird perfectly . However, to get the full experience, you may want to check the "Use system title bar and borders" option in Chrome settings ("Personal Stuff") tab.

Firefox 4

Bluebird already looks great with Firefox 4 but you can use a theme called "QSQ" to get nicer buttons and a "more integrated" overall look - even though it doesn't matches the Bluebird colors perfectly.

If you want to be able to move the Firefox 4 menu (button) to the right but have a blue icon like in QSQ and not orange, install the Movable Firefox Button extension, move the menu button then disable the Movable Firefox Button extension.